Improved machine for bending the lips of auger-bits



J. S N J 2 SheetsShge't 1.

' Making Auger Bits. lye. 100,816. V Patented March 15, 1870 a: v2 fwazzzor- N wnsns Phomuthugrapher, Wnhingmn. o. c.

,2 Sheets-Shet 2 J. SWAN.

Making Auger Bits.

Patented March 15, 1870;

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AJAQM/E-S IsWANmr SEYMOUR,-

. Lam Patent No. 10o,s1o, dated March15, 1870.

CONNECTICUT.

IMPROVED MACHINE PO R BENDING- THE LIPS OP AUG-ER-BITS.

The Schedule referred to in these Lett To all whom it may concern.- B it known that I, JAMEs SWAN, of Seymour, in

' the county of New Haven, and State of Connecticut,

have invented a new and useful Improvements in Machine .for Forging Auger-Bits by Means of Rolls; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in 'the ant to make and use the same, reference being bad to the accompanying drawings forming part of this specification.

This invention relates to the manufacture of angerbit lips by machinery, and consists in certain improvements thereon which will be more particularly specitied hereinafter. f

In the accompanying sheet of drawings- Figure 1, Sheet I, represents a sectional side elevation of the machine, the section being through thelinc a: it of fig. 2. a

Figure 2, Sheet I, is a top orplan view.

Figure 3, Sheet II, is a vertical cross-section of fig. 2 through the line 3 y.

Figure 4 is a face view of the bit-holder, showing the horn-like attachment on each of its sides.

Figure 5 represents the cam motion by which the forming-rolls and sliding base-plate are made to approach toward and rccede from the bit-holder.

Figure 6 represents the formof the lips of the bit before the bit enters the machine. I

Figure 7 represents the form of the bit after it has been operated upon by the machine.

FigureS is a vertical section of a portion of the head or block, in which the shafts carrying theforging-rollers have adjustable spring bearings.

Similar letters of reference indicatecorresponding parts.

In order that any boring-bit may properly work in wood, it is necessary that the lips should be sheared or beveled backward. from their cutting-edges toward the pod, both on their upper faces and on their sides. This perfection of form is technicallycalled the clear]? and without itthe implementwill bind in the wood and be inoperative,

By no process of hand-forging, nor by any forging .apparatus hitherto invented, can this clear be given with anything like sufficient accuracy of proportion to chinery, for the reason that the insides of the lips have ers Patent and making part of the same.

never been formed by projections from crimp dies. Now, such projections, issuing as they must from dies inside the throat of the bit, can never be made large enough at their extremities to give the proper amount of flare to the mouth. If they were made large enough they could not be extricated from the dies.

By my improvement both the clearand the proper amount of flare in the mouth of the bit are obtained in one operation. The horn-like attachmentsor projections to the bit-holder enter the mouth of the hit from the outside, and are thereforercadily withdrawn, while they admit being made fully as large asthe interior of the mouth is intended to bel i The motions necessary for performing the various operations will be understood by more particular refercnce to the drawings.

A is the bed-plate of the machine.

13 is the driving-shaft.

O 0 represent the forming-rollers.

D D are the shafts, upon the ends of which'these rollers are firmly keyed or fastened.

E E are gear-wheels on the shafts D. These shafts have spring bearings in the heads, which oscillate or are given a partial revolution on the driving-shaft 13, back and forth. 1

It will be seen that by. means of the cap a, (fig. 8,)

and the springs and bearing pieces 0', the shafts D may be adjusted toward or from each other. Said shafts reston the bearing pieces 0', so that, on the rotation of the heads, the forging-rollers may be brought slightly nearer each other at the desired point by means of the guides R, in order to operate on the blank.

The boxes of the driving-shaft B are stationary, in brackets projecting from the vertical plate F, one of which brackets is seenin the cross-section, fig. 3, (Sheet 11,) marked G.

H is a gear-wheel on the driving-shaft, which meshes into the spur-wheels on shafts and drives the rollersl An oscillating mot-ion or reciprocating partial revolution is given the rollers by-means of cogs on the circular side I of one of the heads to which the rollerboxes are attached, and the rack J, which engages therewith, (seen in fig. 3.)

This rack receives a reciprocating vertical motio from a crank-pin in the disk-wheel K, which is on the end of the shaft L. This shaft is confined to the plate F by the bracket boxes M N.

Njs a vertical shaft, which is revolved by the wormgear 0, and it revolves the shaft L by means of the miter gear-wheels P P.

R R represent circular guides, so formed or constructed as to allow the rollers to spread from each other during one portion of their revolution, and to approach each other during the other portion. The

resistance offered by the metal between them serves This motion is given (in one direction) by means of.

the cam T on the end of the uprightshaft N, beneath the bed A, (seen in fig. 1.)

The shaft passes through the bed in a slot, 1:, as seen in the drawing, and the cam acts against the stationary roller V. The action of the cam throws the plate, and consequently the rollers 0, toward the bitholder, or forward. The back motion is produced by means of springs \V, (seen in fig. 2.)

X represents the bit-holder in two parts, attached to the movable jaws 3 3/. These jaws are operated by a right and left-handed screw, 2, so that the parts of the bit-holder a: are separated or drawn together by revolving the screw. This is done by means of the crank Z.

The jaws y y slide in a dovetail recessin the bed A, as seen in fig. 1.

The heated blank, (as seen in fig. 6,) is properly secured in the bit-holder by means of i the jaws y y, and the machine is setin. motion by power applied to the driving-shaft B. For a right-hand bit the ma chinery turns to the left, and vice versa. The forming-rollers are advanced by means of the cam, and commence to roll the heated metal before them in the direction of the extremities of the lips, the interior shape of the mouth of the bit being preserved by the anvil-horn extremities of the two horn-likeattachments to the parts of the bit-holder. These attachments or projections are marked a a.

The rolls also commence their oscillation, and, as they oscillate, the cam further advances them and causes them to impinge more and more on the face of the bit, which is thereby sheared orbeveled more and more from the point of first contact. At the same time the guides R cause the rolls to approach each other, and, as a consequence, the sides of the lips are sheared or beveled more and more from the first point ofcontact. This shearing progresses during the half oscillation, and until a perfect clear is obtained. The rolls then perform their return movement, (produced by the springs, but governed by the cam,) and though, by their continued rotation on their axes, they yet continue to roll out the metal of the bit in the direction of the cutting-edges, they, by the reverse ac tion of the cam and of the guides, rccede from each other and from the bit-holder, and do not mar or injure what they have accomplished, in giving clear to the bit, but simply thin away the metal until all that was superfluous in the stock is rolled out beyond the point where the cutting-edges of the bit terminate.

After this the machine is stopped and the bit is removed. Nothing remains to be done but to remove the superfluous metal from the points beyond the cutting-edges. A bit is then obtained with a clear, and with sufficiently flaring months, from this operation alone.

It is obvious that if the oscillating motion be given to the bit itself around lits long axis, combined with the cam motion, (instead 'of to the pair of rollers,) the same or a similar result would be produced, provided the rolls were made to approach and recede, as above described.

The application of rollers to the forging or forming of lips of auger-bits being new,.I desire it to be distinctly understood that I do not confine myself to the shape, number, or manner of using them for this purpose.

The advantages of this machine over any machine or device hitherto adopted for the purpose are, the cutting-lips are brought to the proper shape and form in the most perfect and expeditious manner.

Having thus described my invention,

I claim as new and desire to secure by Letters Patent' I 1. The combination with the bit-holderxand horns a a of the pair of lip-swaging rolls, arranged and operating as shown and described.

2. The combination of the -pair of swaging-rolls with the mechanism herein described for imparting to said pair of rolls an oscillating motion, substantially as set orth.

3. The arrangement of the rolls and their operative mechanism upon a sliding plate, S, so that their relative position will remain unchanged, and all will move together to and from the blank.

4. The combination of upright rotating shaft N, plate S, and bed-plate A, slotted at u, with cam T and friction-roller V, the former attached to said shaft and the latter to said bed plate, all arranged and operated in the manner and for the purpose specified.

5. The combination of the guide-yoke R and oscillating pair of rolls, arranged and operating in conj unction one with the other, substantially as described.

JAMES SWAN.

' Witnesses:

B. W. SMITH,

J. H. SWAIN. 

